Malicious PDF — malware analysis report

Static analysis result for SHA-256 8797eff38dfa4c36…

MALICIOUS

PDF

87.7 KB Created: 2021-09-08 15:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a8b197c4b7bbb9b0b663b05fca721438 SHA-1: 31d34605dce127ad00f8b2ceb393ef760aadd6f5 SHA-256: 8797eff38dfa4c362afa4b9ab42a88e290b7acf1dbf0e9d1662243a78fbca91c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a malicious PDF by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of numerous links and the use of disposable hosting suggest an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://coverline.ro/userfiles/file/betanutulajemovo.pdf In PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/42652323880.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134764c14f5d---gilojulumibumidojarapep.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/69556705640.pdfIn PDF document text
    • https://medius.sk/userfiles/file/jenobituxifidigitipige.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/jibob.pdfIn PDF document text
    • http://baltyk.recykling-rejs.pl/imgturysta/files/lelimamapidirekavonot.pdfIn PDF document text
    • http://www.amanuttarakhand.org/ckfinder/userfiles/files/wigikatekopunizejajefev.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/38342905713.pdfIn PDF document text
    • http://rayer.cn/d/files/navekugujefuwizuwegoz.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/39958302879.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/wuxobijuloxi.pdfIn PDF document text
    • http://eternoohydro.com/d/files/rexiwujuselexep.pdfIn PDF document text
    • https://alohasafaris.com/files/jemonalinajazafajebuf.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134f6f58a1ff---73448588919.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/lapusonavexo.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/84698218538.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/70152491176.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd3022d357---5269713176.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd85e33fd2---24697276717.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/vefazedaletomew.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/42769929002.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/78001493540.pdfIn PDF document text
    • https://actorconseil.com/files/file/39830796477.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=preposition+worksheets+for+grade+7+with+answers+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04E 17936 bytes
SHA-256: 672e639cf3d4dc8bca2b2c0ea8e1f9f603a65d1cb4cf9eda999e7fee7a194464
font_01_sfnt_off00011eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAF 10960 bytes
SHA-256: f3d786fb9cad9b97d1bcbb89e27c84aa135286eb3c6890e945611cb01b0d3b97
font_02_sfnt_off000137fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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